#include <stdio.h>
#include <unistd.h>
#include <signal.h>
#include <stdlib.h>
#include <time.h>
#define rdtsc(low,high) __asm__ __volatile__("rdtsc" : "=a" (low), "=d" (high))
timer_t tt;
void handler (int sig, siginfo_t * extra, void *cruft)
{	
	static last_i=0;
	unsigned int i,j;
	rdtsc(i,j);
	printf ("time:%u, %u, [%u] %uHZ ", j, i, i-last_i, (i-last_i)*10/1000000);
	last_i = i;
}

int main ()
{	int i=0;
	sigset_t sigset;
	sigfillset (&sigset);
	sigdelset (&sigset, SIGRTMIN);
	sigprocmask (SIG_SETMASK, &sigset, NULL);
	struct sigaction sa;
	sigfillset (&sa.sa_mask);
	sa.sa_flags = SA_SIGINFO;
	sa.sa_sigaction = handler;
	if (sigaction (SIGRTMIN, &sa, NULL) < 0)
	{
		perror("sigaction failed");
		exit (-1);
	}
	struct sigevent timer_event;
	struct itimerspec timer;
	timer.it_interval.tv_sec = 0;
	timer.it_interval.tv_nsec = 100 * 1000 * 1000;
	timer.it_value = timer.it_interval;
	timer_event.sigev_notify = SIGEV_SIGNAL;
	timer_event.sigev_signo = SIGRTMIN;
	timer_event.sigev_value.sival_ptr = (void *) &tt;
	if (timer_create (CLOCK_REALTIME, &timer_event, &tt) < 0)
	{
		perror ("timer_create failed");
		exit (-1);
	}
	if (timer_settime (tt, 0, &timer, NULL) < 0)
	{
		perror ("timer_settime failed");
		exit (-1);
	}
	while (i++ < 10)
	{
		pause ();
	}
	return 0;
}
